Pump gas or race fuel?
using a camshaft to bleed compression is a band aid.
We know that
As I said we're jus pissing in the wind.
Iron heads and 189psi are not gonna play nice together.
Nor will a VP of over 160, be useful in a streeter.
But OP already owns the cam, so we can at least entertain the idea of using it.
It will work just fine at;
Ica of 72@2000ft
Static compression ratio of..................................
11:1.
Effective stroke is 2.92 inches.
Your dynamic compression ratio is
8.30:1 .
Your dynamic cranking pressure is.......................
160.88 PSI.
Your effective boost compression ratio, reflecting static c.r.,
cam timing, altitude, and boost of
nil PSI is............
7.90 :1.
V/P (Volume to Pressure Index) is .........................
144
As I said the Wallace Dcr Calculator has now been corrected to spit out the same Dcr no matter the elevation, so you gotta look at the
>Effective boost compression ratio of 7.90
>161 psi may be a lil high for iron, but should work with pumpgas and a careful tune.
>VP of 144 is not as likely to be as hard on tires, but we can't do anything about that, with iron heads.
> less Scr will be more pumpgas friendly, but the VP is falling fast, so pretty soon it will need a hi-stall
> this combo at 11/1 will already want gears, to cruise at over 2400rpm
> This combo, as it stands, wants alloy heads to go with that 11.82Scr , OR a later-closing Ica for iron, OR a dedicated anti-detonant injection system. As YR and others have said or hinted at, getting 11.8Scr with no quench would be a serious challenge, so I think it's pretty safe to say that the 11.82 number is an error. 11.82 would require a total chamber volume of;
836/10.82=
77.27cc, doable but .............
>I don't like this 288/294/110 cam for a street combo, because, altogether,
IMO,
for a streeter, it's hard to strike a happy tune.
But until we see the piston in the hole, we are all just flicking snot on the wall, OOps, I mean speculating.
